Lexus RX 450h Owner's Manual page 528

526 7-2. Steps to take in an emergency
The tire pressure warning light may
■
come on due to natural causes (vehicles
with the tire pressure warning system)
The tire pressure warning light may come
on due to natural causes such as natural air
leaks or tire inflation pressure changes
caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the
warning light (after a few minutes).
When a tire is replaced with a spare tire
■
(vehicles with the tire pressure warning
system)
Vehicles with a compact spare tire: The
compact spare tire is not equipped with a
tire pressure warning valve and transmitter.
If a tire goes flat, the tire pressure warning
light will not turn off even though the flat tire
has been replaced with the spare tire.
Replace the spare tire with the repaired tire
and adjust the tire inflation pressure. The
tire pressure warning light will go off after a
few minutes.
Vehicles with a full-size spare tire: The spare
tire is also equipped with a tire pressure
warning valve and transmitter. The tire pres-
sure warning light will turn on if the tire infla-
tion pressure of the spare tire is low. If a tire
goes flat, the tire pressure warning light will
not turn off even though the flat tire has
been replaced with the spare tire. Replace
the spare tire with the repaired tire and
adjust the tire inflation pressure. The tire
pressure warning light will go off after a few
minutes.
Conditions that the tire pressure warn-
■
ing system may not function properly
(vehicles with the tire pressure warning
system)
P.481
Customization
■
Some functions can be customized.
(P.574)
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WARNING
If both the ABS and the brake system
■
warning lights remain on
Stop your vehicle in a safe place immedi-
ately and contact your Lexus dealer.
The vehicle will become extremely
unstable during braking, and the ABS
system may fail, which could cause an
accident resulting in death or serious
injury.
When the electric power steering
■
system warning light comes on
When the light comes on yellow, the
assist to the power steering is restricted.
When the light comes on red, the assist
to the power steering is lost and handling
operations of the steering wheel become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual.
If the tire pressure warning light
■
comes on (vehicles with the tire pres-
sure warning system)
Be sure to observe the following precau-
tions.
Failure to do so could cause a loss of
vehicle control and result in death or
serious injury.
Stop your vehicle in a safe place as
●
soon as possible. Adjust the tire infla-
tion pressure immediately.
If the tire pressure warning light comes
●
on even after tire inflation pressure
adjustment, it is probable that you have
a flat tire. Check the tires. If a tire is flat,
change it with the spare tire and have
the flat tire repaired by the nearest
Lexus dealer.
Avoid abrupt maneuvering and brak-
●
ing.
If the vehicle tires deteriorate, you
could lose control of the steering
wheel or the brakes.